anaconda update time needs to be improved

[John Reiser]

> I have updated 3 boxes from FC5->FC6 (x86_64) using anaconda (booted
> from a DVD).

> Update time was ~90-120min depending on the sys.

It feels like there is a quadratic algorithm somewhere,
plus slow database operation (non-cached, or poor transactions):
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=208725
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=208717
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=209323
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=208726

Also, mere package install itself can speedup by a factor of 5:
http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=71184

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